Earth’s gravity pulls on all objects. Near the surface of the earth, the acceleration of all objects due to gravity is the same. Drop a penny and a pen from the same height and they will hit the ground at the same time. When objects travel down an inclined plane, gravity is pulling them downward, but the plane is exerting a force on the object, which makes it fall along the plane rather than straight down. Two marbles, regardless of size, will accelerate at the same rate. The two marbles should reach the bottom of the plane at the same time.
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